CMC Triggers AR-15 Bolt Carrier Group Features The CMC Triggers AR-15 Bolt Carrier Group is machined to full mil-spec dimensions ensuring drop-in compatibility with standard AR-15 upper receivers chambered in 5.56 NATO .223 Remington or .300 Blackout. The nickel boron finish is applied specifically to reduce friction between the carrier and the inside of the receiver which translates into smoother cycling and less heat buildup during extended strings of fire. Because carbon and fouling do not bond to nickel boron the way they do to standard phosphate coatings cleanup after a range day is as simple as wiping the carrier down with a rag rather than scraping baked-on residue. Shooters who have spent an evening scrubbing a traditional BCG will immediately notice the difference this coating makes. Reduced internal friction also means many shooters can run this bolt carrier group with noticeably less lubrication than a standard parkerized or black nitride carrier without sacrificing reliability. The bolt carrier group is often described as the heart of the rifle and investing in a quality low-friction part here pays dividends in both reliability and reduced maintenance time over the life of the rifle. Made in the USA this BCG is built to the quality standard American shooters expect from a duty or competition-grade AR-15 component. The CMC Triggers AR-15 Bolt Carrier Group is available for sale at GrabAGun for builders and owners who want an easier-to-maintain smoother-cycling rifle. CMC Triggers AR-15 Bolt Carrier Group Specifications Manufacturer: CMC Triggers Model: AR-15 Bolt Carrier Group Type: Bolt Carrier Group Compatible Hosts: AR-15 Caliber Fit: 5.56 NATO / .223 Rem / .300 Blackout Finish: Nickel Boron Color: Black Available At: GrabAGun